Abstract:Chemical analysis, scanning electron microscopy, X-ray energy dispersive spectrometer,and automatic mineral analysis system were used to study the distribution regularity and enrichment state of niobium in independent minerals in Aegirine-Type niobium-rare earth iron ore in Bayan Obo Main Mine,the results show that the grade of rare earth in aegirine-type niobium-rare earth iron ore is 9.1%,the rare earth minerals are mainly bastnasite and monazite,and the ratio is about 2:1;the main elements are light rare earth elements;the grade of niobium is as high as 0.27%,the main niobium minerals are aeschynite,pyrochlore,nigrine,niobite and fergusonite,the highest content of aeschynite is 0.30% in the five minerals, and the occurrence state of niobium independent minerals mainly consists of fine and fine inclusions in other minerals;the mass ratio of niobium in niobite is the highest, up to 54.53%,the distribution rate of niobium in aeschynite is the highest,up to 31.80%, and the total niobium content of the five kinds of niobium minerals accounts for 80.59% of the total niobium content in this kind of ore.